做个同时带Text和Value的ComboBox

 

.NET 2.0 Web控件的ComboBox就比WinForm的ComboBox好，可以同时储存显示值和实际值。这个很重要，比如有个下拉框选择工作人员，显示的是姓名，实际交给系统处理是工号。

以前都是特地用个DataTable辅助的，比较麻烦。首先复制DataTable里的每一行的某个字段（比如姓名）到ComboBox的每一项，然后在comboBox1_SelectedIndexChanged事件里，得到当前的ItemIndex，回过头去找DataTable.Rows[该ItemIndex]["工号"].ToString()

这样做不是不可以，但总归感觉很怪。今天发现原来还有别的方式可以实现。

首先定义一个类（定义完了就不用去管它了，一直可以用）

using System;
using System.Collections.Generic;
using System.Text;

namespace AboutComboBox
{
    class TextAndValue
    {
        private string _RealValue = "";
        private string _DisplayText = "";

        public string DisplayText
        {
            get
            {
                return _DisplayText;
            }
        }

        public string RealValue
        {
            get
            {
                return _RealValue;
            }
        }

        public TextAndValue(string ShowText, string RealVal)
        {
            _DisplayText = ShowText;
            _RealValue = RealVal;
        }

        public override string ToString()
        {
            return _RealValue.ToString();
        }

    }
}

使用时，先制造一个ArrayList，然后绑定到ComboBox。选择时，简单调用comboBox1.SelectedValue.ToString()就行了！

代码如下：

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace AboutComboBox
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private static DataSet ds = new DataSet();

        private void Form1_Load(object sender, EventArgs e)
        {
           
            ArrayList al = new ArrayList();
            al.Add(new TextAndValue("张三","zs10111"));
            al.Add(new TextAndValue("李四", "ls10253"));
            al.Add(new TextAndValue("阿拉蕾", "A20876"));

            comboBox1.DataSource = al;
            comboBox1.DisplayMember = "DisplayText";
            comboBox1.ValueMember = "RealValue";

            ArrayList al2 = new ArrayList();
            al2.Add(new TextAndValue("火腿", "9601101"));
            al2.Add(new TextAndValue("肉松", "9601202"));

            comboBox2.DataSource = al2;
            comboBox2.DisplayMember = "DisplayText";
            comboBox2.ValueMember = "RealValue";

        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            //MessageBox.Show(comboBox1.SelectedValue.ToString());
        }

        private void comboBox2_SelectedIndexChanged(object sender, EventArgs e)
        {
            //MessageBox.Show(comboBox2.SelectedValue.ToString());
        }
    }
}